CN206892305U - A kind of NMR imaging device - Google Patents

Abstract

The utility model discloses a kind of one magnetic force structure of NMR imaging device by two rectangular permanent magnets, four triangle lamination integrated magnets and four trapezoidal permanent magnets are formed, and NMR imaging device further constitutes a radio frequency by its frequency modulation system；Using said structure, financing requirement will be substantially reduced, this widely uses the education and scientific research mechanism for being absorbed in MRI applications and all kinds of laboratories.

Description

A kind of NMR imaging device

Technical field

It the utility model is related to a kind of NMR imaging device.

Background technology

Nuclear magnetic resonance (NMR) spectrum is a powerful, non-destructive analysis for the chemical composition and structure of research material Technology.Magnet magnetic resonance imaging (MRI) has used the internal image that similar technology goes to research institute that object is presented.Exist according to Lapie First passage in 1938 measures molecular beam to describe the principle of nuclear magnetic resonance.After 8 years, in nineteen forty-six, Felix Bloch The technology of refining is used for liquid and solid with Edward Mil Si Purcell, they have shared nineteen fifty-two Nobel's physics Prize.

Traditional nuclear magnetic resonance apparatus is very big very expensive.The root problem that the multipurpose of magnetic resonance imaging uses is Extensive accessory is allowed to use, this can cause physical size and fund cost too high.Therefore cause installation cost high, maintenance cost It is high.Although electronic product is had proved to be easily by voltage and dimension is reduced to reduce size, magnet is generally being made more Hour can lose field strength, and the movement for causing to cool down superconductor can also prevent superconducting magnet scaled.

Now it is desirable that the size of magnet is reduced significantly at room temperature, and the corresponding NMR system that reduces owns Coherent element specifically refines magnetic insert, gradient coil, to be coupled to more radio circuits to desk-top size with this.

Utility model content

The utility model solve technical problem be to provide it is a kind of by one have north and south poles permanent magnet form, often Pole is consistent in North and South direction, is all intended to minimize magnetic linkage with the lateral column of a pair of magnetization polarities per pole, and maximize center Magnetic field is so as to greatly improving the NMR imaging device of magnetic field homogeneity.

The technical solution of the utility model is a kind of NMR imaging device, and it includes the transmitting of radio frequency and connect Receive circuit, magnetic insert and the permanent magnet being made up of three solid magnetic structures, it is characterised in that：The permanent magnet includes at least two Right-angle prism, at least four right Dove prisms, at least four right-angle prismatic posts, a closed cavity；At least two right-angle prismatics Post is the permanent magnet manufactured with the magnetic aligning with the maximum surface normal, at least two right-angle prismatic posts be with the maximum The permanent magnet of the magnetic aligning manufacture of surface normal, and the permanent magnet of the north orientation with an angle of 90 degrees towards the triangle, and And at least two right-angle prismatic post to be permanent magnet be bisected into an angle of 90 degrees of triangle and orientation towards north with magnetic aligning orientation Maximum surface, at least two right-angle prisms are the permanent magnets manufactured with the magnetic azimuth with the maximum surface normal, and attachment Two right triangular prisms are to be presented the first rectangular prism of the magnetic lenses that the arctic is inwardly focused on to chamber, and two right sides three of attachment Angular prism to be presented the magnetic lens for being directed away from cavity and outwards deploying the arctic, first pair of right Dove prism be by with The permanent magnet of the magnetic aligning of the greater in two parallel surfaces, the wherein Northern Dynasties are smaller into two parallel surfaces Person, it is to use that right Dove prism, which is attached to the right-angled triangular prism of the arctic with an angle of 90 degrees and second pair of right Dove prism, The permanent magnet of the magnetic direction manufacture orthogonal with less two parallel surfaces in two parallel surfaces, wherein the north is flat towards two Larger surface in row surface, second pair of right-angled triangular prism are attached to right-angled triangular prism, wherein each right Dove prism Acute angle is attached on the acute angle of the second right Dove prism, and the first backing plate is connected to the first rectangular prism and first pair in cavity Right angle trigonometry prism, the second backing plate are connected to the second rectangular prism and second pair of right angle trigonometry prism, and second pair of backing plate is total to for magnetic Imaging of shaking provides the quadrupole field uniformity around sample, includes the outer yoke of high-permeability material, its fully enclosed described rib The outer surface of mirror.

The technical solution of the utility model can also be the closed cavity, and it includes：a）Elongate loop with longitudinal axis Shape main body, including multiple essentially homogeneously magnetized permanent magnet magnet materials, it forms cavity by its inner surface, described Annular body has cross section in the X/Y plane of cartesian coordinate system, and the cavity is in top, bottom, left side and right side envelope Close, except the end for introducing and remove object and transmitting and reception radiofrequency signal, b）Made of permanent magnet material A pair of rectangular prisms, two pairs of right-angle prismatic posts and two pairs of right trapezoidal prisms, the prism is longitudinally-aligned along longitudinal axis, Yi Jizheng X/Y plane is met at, the intensity in magnetic field is orientated by assembling the Y-axis that is oriented along of the magnetic pole in prism, d）Magnetic field in cavity takes To the inner surface prism perpendicular to rectangle, and e）The outer yoke of high-permeability material, the appearance of its fully enclosed prism Face.

The technical solution of the utility model can also be that the magnetic insert includes being attached to the first rectangular prism and first pair First backing plate of right-angled triangular prism, and the second backing plate of the second rectangular prism and second pair of right triangular prism is attached to, with And also include the 3rd backing plate and the 4th backing plate orthogonally arranged with first backing plate and second backing plate.

The technical solution of the utility model can also be that the prismatic permanent magnets are made up of rare earth alloy, and the rare earth closes Operated in the range of linearity that gold is magnetized to demagnetize characteristic at it.

The technical solution of the utility model can also be that it also includes the radio frequency for MR imaging apparatus（RF）Component, Transmitting and receiving coil including being coupled to tuning network, the tuning network, which is coupled to, changes weighing apparatus.

The technical solution of the utility model can also be also include being coupled to it is described change weighing apparatus and be further coupled to transmitting/ Receive and be further coupled to Noise gate and the tuned relay of preamplifier.

The technical solution of the utility model, which can also be, also to be included being coupled to the radio frequency（RF）The transmitting of component external is defeated Enter the Noise gate of power supply, the tuned relay is coupled to the tuned cell of the component external, and tuning control is defeated Enter, and the tuning network further comprises coarse adjustment regulation and fine setting regulation.

The technical solution of the utility model can also be also to include being coupled to and described change weighing apparatus and be further coupled to noise The active transmitting of door and preamplifier/reception switch.

The technical solution of the utility model, which can also be, also includes the tuning loops for being coupled to attenuator and Noise gate component, Attenuator and the Noise gate component is further coupled to outside port, is used to calibrate so as to introduce tuning signal.

The technical solution of the utility model, which can also be, also includes the tuning cutting back for being coupled to attenuator and Noise gate component Line, it is further coupled to outside port, is used to calibrate so as to introduce tuning signal.

The technical solution of the utility model, which can also be, also to be included being coupled to the preamplifier and being further coupled to The external receiver of display, so as to realize visualization fine setting.

The beneficial effects of the utility model are by least two right-angle prisms, at least four right Dove prisms at least four Individual right-angle prismatic post, a closed cavity；At least two right-angle prismatic posts are with the magnetic aligning system with the maximum surface normal The permanent magnet made, at least two right-angle prismatic posts are the permanent magnets manufactured with the magnetic aligning with the maximum surface normal, and The permanent magnet of north orientation with an angle of 90 degrees towards the triangle, and at least two right-angle prismatic posts are that permanent magnet is taken with magnetic An angle of 90 degrees of triangle and orientation towards north are bisected into maximum surface to orientation, at least two right-angle prisms be with it is described The permanent magnet of the magnetic azimuth manufacture of maximum surface normal, and two right triangular prisms of attachment are inwardly focused on the arctic with presenting First rectangular prism of the magnetic lenses of chamber, and two right triangle prisms of attachment are directed away from cavity and outwards deploy north to present The magnetic lens of pole, first pair of right Dove prism is by the magnetic aligning with the greater in two parallel surfaces Permanent magnet, wherein smaller of the Northern Dynasties into two parallel surfaces, right Dove prism be attached to the arctic with an angle of 90 degrees Right-angled triangular prism and second pair of right Dove prism be with less two parallel surfaces in two parallel surfaces just The permanent magnet of the magnetic direction manufacture of friendship, wherein surface larger in two parallel surfaces of direction of the north, second pair of right angle trigonometry rib Mirror is attached to right-angled triangular prism, wherein the acute angle of each right Dove prism is attached on the acute angle of the second right Dove prism, The first backing plate is connected to the first rectangular prism and first pair of right angle trigonometry prism in cavity, and the second backing plate is connected to the second rectangle Prism and second pair of right angle trigonometry prism, second pair of backing plate provide the quadrupole field uniformity around sample for magnetic resonance imaging, Also include the outer yoke of high-permeability material, the outer surface of its fully enclosed prism；The closed cavity it include：a）Have The elongated annular body of longitudinal axis, including multiple essentially homogeneously magnetized permanent magnet magnet materials, it passes through in it Surface forms cavity, and the annular body has cross section in the X/Y plane of cartesian coordinate system, and the cavity is at top, bottom Portion, left side and right side closing, except the end for introducing and remove object and transmitting and reception radiofrequency signal, b）By permanent A pair of rectangular prisms made of magnet material, two pairs of right-angle prismatic posts and two pairs of right trapezoidal prisms, the prism is along longitudinal axis It is longitudinally-aligned, and X/Y plane is orthogonal to, the intensity in magnetic field is orientated by assembling the Y-axis that is oriented along of the magnetic pole in prism, d） The inner surface prism for being oriented perpendicularly to rectangle in the magnetic field in cavity, and e）The outer yoke of high-permeability material, it is sealed completely Fill the outer surface of the prism；Such a permanent magnet with north and south poles is formed, and is consistent per pole in North and South direction. All it is intended to minimize magnetic linkage with the lateral column of a pair of magnetization polarities per pole, and it is equal so as to greatly improve magnetic field to maximize central magnetic field Even property, using a piece of permanent magnet material as carrier, scope is 0.3 T to 0.64 T in caused magnetic field, it is achieved thereby that improving magnetic field The effect of uniformity.

Brief description of the drawings

Figure lA is the cross-sectional view of MR imaging apparatus

Figure 1B is the lateral surface figure of MR imaging apparatus

Fig. 1 C are the outer front views of MR imaging apparatus

Fig. 1 D are the outward appearance rearviews of MR imaging apparatus

Fig. 2A is the preceding interior views of MR imaging apparatus

Fig. 2 B are the side views of MR imaging apparatus

Fig. 2 C are the perspective internal views of MR imaging apparatus

Fig. 3 A are the schematic diagrams of the radio circuit of a MR imaging apparatus with tuning relay

Fig. 3 B are the radio circuit figures of a MR imaging apparatus with resonant tank

Fig. 3 C are the radio circuit figures of a MR imaging apparatus with tuning stub.

1, first rectangular prism in figure, 2, right angle prism, 3, Dove prism, 4, shielded gradient coil, the 5, second rectangle Prism, 6, irony pole piece, 7, iron or steel, 8, iron or steel, 9, iron or steel, 10, backing plate, 11, side backing plate, 12, gradient coil, 13rd, LED light lamp, 14, retainer, 15, sample, 16, RF coils, 17, sample cell, 18, front door, 19, gradient coil filtering Device shell, 20, RF package shells, 21, temperature stability air duct, 22, signal generator, 23, external receiver, 24, line Enclose tuning network, 25, balance converter, 26, tuned relay, 27, active transmitting receive switch, 28, Noise gate, 30, power supply Wave filter, 32, outside tuning indicator, 33, resonant tank, 34, attenuator, 35, outside port, 36, tuning indicator, 38th, trimmer.

Embodiment

Refer to the attached drawing.As shown in Figure 1A, the equipment includes being connected to the first rectangular prism 1 of two right angle prisms 2, often Individual right angle prism is attached right Dove prism 3, and it has the north magnetic pole being outwardly directed from the concave surface limited by prism.The equipment is also The second rectangular prism including being attached to two right-angled triangular prisms, each right-angled triangular prism are attached to right Dove prism, its Middle north magnetic pole is inwardly directed towards the concave surface limited by second group of prism.Two high-purity irony pole pieces 6 are placed on by magnetic In the cavity that prism limits.Magnetic prism is surrounded what is returned to provide for magnetic flux by the ferrous material of such as iron or steel 7,8 and 9 Support and yoke.The device also includes top and bottom backing plate 10 and side backing plate 11, to compensate the inequality of the field as caused by prism Even property.Gradient coil 12 provides pulsed field gradient and enables to sense nuclear magnetic resonance in detail.

In one embodiment, shell is illuminated by least row's LED light lamp 13.In one embodiment, component branch Support and encapsulating sample, sample include the pedestal for sample cell 17, RF coils 16, for the sliding tube of sample 15, and sample Support and retainer 14.

As shown in external side view 1B, embodiment of the present utility model has front door 18, gradient coil filter housing 19 With RF package shells 20.Shown in external front view 1C, embodiment of the present utility model has front door 18.In outside rearview 1D In, embodiment of the present utility model has gradient coil filter housing 19, RF package shells 20 and temperature stability air hose Road 21.

In fig. 2, front view shows sample cell, RF coils 12（Transmitting and reception）, for sample sliding tube and The sample holder and the details coil of retainer being suspended between the first primary gradient coil ＆ RF shieldings and the second primary gradient With RF shieldings 4.In an illustrated embodiment, primary gradient coil by nonactive component G-10 in structural support.Shown Embodiment in, the utility model also include be attached to non-active component G-10 outer surface a pair of active shieldings gradient line Circle.In fig. 2b, the sample branch that side view shows the side of the sliding tube for sample and is suspended between gradient coil Support member and retainer.In fig. 2 c, perspective view shows the sliding tube and suspension for sample and sample holder and retainer RF coils between gradient coil.

As shown in Figure 3A, the device includes the radio frequency with tuning control（RF）Circuit.Radio frequency（RF）Circuit include comprising The radio frequency component 19 of signal generator 22 and receiver 23.

Radio frequency for laboratory magnetic resonance imaging system（RF）Component 19 includes being coupled to coil tuning network 24 and micro- Balance-balun 25 is coupled in the transmitting and receiving coil 11, tuning network for adjusting capacitor 38, converter coupling To tuned relay 26.

Radio frequency component also includes being coupled to tuned relay and is further coupled to having for Noise gate 28 and preamplifier Source transmitting receives switch 27, and wherein preamplifier is coupled to D/C power wave filter 30 and is coupled to the output of RF components.Tuning Degree is indicated by outside tuning indicator 32.

As shown in Figure 3 B, embodiment of the present utility model, which has, is coupled to balance-balun and further coupling Close transmitting/reception switch of Noise gate and prime amplifier.Radio frequency component also includes resonant tank 33, for small-signal to be introduced Transmitting/receiving coil, and attenuator 34 and Noise gate component are further coupled to, Noise gate component is further coupled to outside Port 35, thus introduce tuning signal and be used to calibrate.Tuning degree is indicated by the tuning indicator 36 turned on receiver.

As shown in Figure 3 C, embodiment of the present utility model includes tuning stub 33, for signal to be introduced into transmitting/reception line Circle, and attenuator and Noise gate component are further coupled to, it is further coupled to outside port, so as to introduce tuning signal For calibrating.

Radio frequency component also includes being coupled to preamplifier and is further coupled to the external receiver 23 of tuning indicator, Thus fine setting degree can realize visualization.

Radio frequency component also includes the Noise gate for the transmitting input power for being coupled to component external, and tuned relay is coupled to group Tuned cell and tuning control input outside part, and tuning network also includes coarse tuning and adjusts and finely tune adjustment.Process is adjusted Humorous control is the variable condenser set in factory, and vernier control 38 is the variable capacitance that there is user to be close to sensor Device.The utility model and the difference of conventional nmr imaging systems are do not have single bandpass filter, because new coil is adjusted Humorous network operates together with the input matching circuit of preamplifier.The utility model controls by using by logic level signal Active transmitting receive switchgear distribution and be different from conventional nmr imaging systems.The area of RF components and conventional nmr imaging RF components It is not small physical location size, it is less than 2% of wavelength under working frequency, and this eliminates the precision impedance between RF components The needs of matching.The difference of complete RF components and conventional RF components is that it is easily removed at the scene, and is replaced by Unit through being customized for application-specific, and only need to finely tune after mounting.

The device also includes the gradient coil of three pairs of active shieldings（X, y, z）, the gradient coil of each active shielding is by double Layer copper foil composition.

A kind of uniform magnetic field for being used to produce the NMR imagings that can realize intracavitary object is disclosed in the present patent application Simple magnetic structure, the magnetic structure include：a）Elongated annular solid, its have longitudinal axis and including it is multiple it is substantially homogeneous by Magnetization prism made of permanent magnet material, cavity is formed by its inner surface, the ring body is in cartesian coordinate system There is cross section, the cavity is closed on top, bottom, left side and right side, except for introducing and removing object in X/Y plane And transmitting and the end for receiving radiofrequency signal, b）A pair of rectangular prisms made of permanent magnet material, two pairs of right-angle prismatics Post and two pairs of right trapezoidal prisms, the prism is aligned longitudinally along longitudinal axis and is orthogonal to X/Y plane, by assembling prism In magnetic pole orientation, the intensity in magnetic field is orientated along Y-axis, c）The interior table for being oriented perpendicularly to right-angle prism in the magnetic field in cavity Face, d）The outer yoke of high-permeability material.

Prismatic permanent magnets are made up of rare earth alloy, are worked in the range of linearity for being magnetized to demagnetize characteristic at it.

Conclusion

The utility model only assembles 5 pairs of permanent magnet blocks, is easier to distinguish with conventional magnetic structure and NMR imaging devices, permanent magnetism Body block is formed as three solid prism shapes：Rectangle, right angled triangle and the right side are trapezoidal.The salient point of gradient coil and pad exists In the bigger improvement to conventional gradients coil and pad.Feature of the present utility model is arranged in chamber and magnet in second pair of backing plate The orthogonal side in field on further embody.

It will be understood by those skilled in the art that the utility model is not necessarily limited to the dimensional structure indicated in the accompanying drawings, these knots Structure has indicated only that the size of specific embodiment.Shown preferred geometries can by follow principle disclosed herein other Geometry replaces.These other geometries are recognized as in the scope of the utility model.It is although combined preferred real Apply example and describe the utility model, it is to be understood that for those skilled in the art, repairing in principle outlined above Change and will be apparent, therefore the utility model is not limited to preferred embodiment, and be intended to include such modification.

The scope of the utility model includes all modifications that will be apparent to persons skilled in the art, design variation, Combination and equivalent, and of the present utility model be previously described and its preferred embodiment is not construed as excluding these.

In this manual " one embodiment ", the reference of " embodiment " or " specific embodiment " are meaned to combine the reality The special characteristic of example description is applied, structure or characteristic are included at least one embodiment of the present utility model, it is not necessary to included in institute Have in embodiment.Therefore, the phrase " in one embodiment " occurred everywhere throughout the specification, " in embodiment " or " in a particular embodiment " it is not necessarily referring to identical embodiment.In addition, the spy of any specific embodiment of the present utility model Determine feature, structure or characteristic can combine with one or more other embodiments in any suitable manner.According to the general of this paper State, other change and modifications of embodiment of the present utility model described and illustrated herein is possible, and is considered as this The feature of utility model and a part for scope.

One or more of element shown in accompanying drawing can also realize in a manner of more separating or integrating, or even at certain It is removed or is rendered as inoperable in the case of a little, these examples are effective under certain application cases.

Unless the context, " one otherwise used in description herein and following claims It is individual ", "one" includes plural with " described ".In addition, as used in description herein and following claims, remove Non- context is otherwise explicitly indicated, otherwise " ... in " implication include " ... in " and " ... on ".

The described above of illustrated embodiment of the present utility model is not intended as exhaustion or is limited to the utility model herein Disclosed precise forms, including the content described in summary.Although this reality is described for illustration purposes only herein With new specific embodiment and example, but if those skilled in the relevant art are in feature of the present utility model and scope Various equivalent modifications are made, and it is possible.As outlined above, according to the described above of embodiment of the present utility model, These modifications can be carried out to the utility model, and these modifications are included in feature and scope of the present utility model.

Therefore, although the utility model is described with reference to specific embodiment of the present utility model herein, upper State and illustrate to change in general introduction, the scope of variations and alternatives, and in some cases, explained not departing from the utility model In the case of the scope and feature stated, the utility model will be used without correspondingly using further feature.Therefore, Ke Yijin Row is many to be changed so that particular case or material are to meet essential scope and feature of the present utility model.

Patent overview

Capital requirement will be greatly reduced so as in education and research arm and various experiments in innovative laboratories MRI system Room uses.

System is made up of a permanent magnet with north and south poles, is consistent per pole in North and South direction.Per pole all companions The lateral column for having a pair of magnetization polarities is intended to minimize magnetic linkage, and maximizes central magnetic field so as to greatly improve magnetic field homogeneity.Magnetic The structure design of iron such as Figure 1A, 1B, 1C, shown in 1D.Using a piece of permanent magnet material as carrier, scope is 0.3 T in caused magnetic field To 0.64 T.

One three-axis mounting is made up of double-deck copper foil, and the device will actively prevent gradient coil from generating 5 G/cm ladders Degree, as shown in Fig. 2A, 2 B and 2 C.Main gradient coil be equipped with a radio shielding with reduce radio-frequency coil and gradient coil it Between interference.

Radio frequency component includes the radio-frequency coil and its tuning circuit and transformer of a transmission and receiving coil, transmits/connects Switch, preamplifier, Noise gate and an example loading procedure are received, as shown in Fig. 3 A, 3 B and 3 C.

Claims (11)

1. a kind of NMR imaging device, it includes transmitting and receiving circuit, the magnetic insert and solid by three of radio frequency The permanent magnet of body magnetic structure composition, it is characterised in that：The permanent magnet includes at least two right-angle prisms, and at least four is right trapezoidal Prism, at least four right-angle prismatic posts, a closed cavity；At least two right-angle prismatic posts be with the maximum surface normal Magnetic aligning manufacture permanent magnet, and the permanent magnet of the north orientation with an angle of 90 degrees towards the triangle, and at least two Individual right-angle prismatic post is that permanent magnet is bisected into maximum surface with magnetic aligning orientation by an angle of 90 degrees of triangle and towards northern orientation, At least two right-angle prisms are the permanent magnets manufactured with the magnetic azimuth with the maximum surface normal, and two right triangles of attachment Prism to be presented the first rectangular prism of the magnetic lenses that the arctic is inwardly focused on to chamber, and two right triangle prisms of attachment with Presentation is directed away from the magnetic lens that cavity outwards deploys the arctic, and first pair of right Dove prism is by with perpendicular to two The smaller of the permanent magnet of the magnetic aligning of the greater in parallel surfaces, the wherein Northern Dynasties into two parallel surfaces, right trapezoidal rib It is with parallel with two that mirror, which is attached to the right-angled triangular prism of the arctic with an angle of 90 degrees and second pair of right Dove prism, The permanent magnet of less two parallel surfaces are orthogonal in surface magnetic direction manufacture, wherein the north towards in two parallel surfaces compared with Big surface, second pair of right-angled triangular prism are attached to right-angled triangular prism, wherein the acute angle of each right Dove prism is attached Onto the acute angle of the second right Dove prism, the first backing plate is connected to the first rectangular prism and first pair of right angle trigonometry rib in cavity Post, the second backing plate are connected to the second rectangular prism and second pair of right angle trigonometry prism, and second pair of backing plate provides for magnetic resonance imaging The quadrupole field uniformity of sample is surrounded, includes the outer yoke of high-permeability material, the outer surface of its fully enclosed prism.

A kind of 2. NMR imaging device according to claim 1, it is characterised in that：The closed cavity it include： a）Elongated annular body with longitudinal axis, including multiple essentially homogeneously magnetized permanent magnet magnet materials, it is logical Cross its inner surface and form cavity, the annular body has cross section in the X/Y plane of cartesian coordinate system, and the cavity exists Top, bottom, left side and right side closing, except the end for introducing and object and transmitting and reception radiofrequency signal are removed, b）A pair of rectangular prisms made of permanent magnet material, two pairs of right-angle prismatic posts and two pairs of right trapezoidal prisms, the prism edge Longitudinal axis is longitudinally-aligned, and is orthogonal to X/Y plane, and the intensity in magnetic field is oriented along Y-axis by assemble the magnetic pole in prism Orientation, d）The inner surface prism for being oriented perpendicularly to rectangle in the magnetic field in cavity, and e）The outer yoke of high-permeability material, its The outer surface of the fully enclosed prism.

A kind of 3. NMR imaging device according to claim 2, it is characterised in that：The magnetic insert includes being attached to First backing plate of the first rectangular prism and first pair of right-angled triangular prism, and it is attached to the second rectangular prism and second pair of right side three Second backing plate of angle prism, and also include the 3rd backing plate orthogonally arranged with first backing plate and second backing plate and 4th backing plate.

A kind of 4. NMR imaging device according to claim 1, it is characterised in that：The prismatic permanent magnets are by dilute Native alloy is formed, and is operated in the range of linearity that the rare earth alloy is magnetized to demagnetize characteristic at it.

A kind of 5. NMR imaging device according to claim 1, it is characterised in that：It also include be used for magnetic resonance into As the radio frequency of device（RF）Component, including it is coupled to transmitting and the receiving coil of tuning network, the tuning network, which is coupled to, to be changed Weighing apparatus.

A kind of 6. NMR imaging device according to claim 5, it is characterised in that：Also include being coupled to and described change weighing apparatus Device is simultaneously further coupled to transmitting/receive and is further coupled to Noise gate and the tuned relay of preamplifier.

A kind of 7. NMR imaging device according to claim 5, it is characterised in that：Also include being coupled to the radio frequency （RF）The Noise gate of the transmitting input power of component external, the tuned relay are coupled to the tuning list of the component external Member, and tuning control input, and the tuning network further comprises coarse adjustment regulation and fine setting regulation.

A kind of 8. NMR imaging device according to claim 5, it is characterised in that：Also include being coupled to and described change weighing apparatus Device and the active transmitting/reception switch for being further coupled to Noise gate and preamplifier.

A kind of 9. NMR imaging device according to claim 8, it is characterised in that：Also include be coupled to attenuator and The tuning loops of Noise gate component, attenuator and the Noise gate component are further coupled to outside port, so as to introduce tuning Signal is used to calibrate.

A kind of 10. NMR imaging device according to claim 9, it is characterised in that：Also include being coupled to attenuator With the tuning stub of Noise gate component, it is further coupled to outside port, is used to calibrate so as to introduce tuning signal.

A kind of 11. NMR imaging device according to claim 9, it is characterised in that：Also include be coupled to it is described before Put amplifier and be further coupled to the external receiver of display, so as to realize visualization fine setting.